MIDImorphosis (http://www.secretbasedesign.com/apps/MIDImorphosis) Captures the pitch of incoming audio and converts it into MIDI notes that can be used to control iOS synthesizers or external equipment; supports both monophonic and polyphonic playing; support for CoreMIDI, Virtual MIDI, DSMIDI WiFi, Audiobus, and background audio; connections to laptop and desktop computers can be made using WiFi or with MIDI adapter cables; app is designed to work best with a guitar or bass; (iOS 6.1 or later).

MIDIflow (http://www.MIDIflow.com) Allows user to send MIDI from app to app; can sync apps with each other or send MIDI parts from a sequencer app to different synth apps; can route the MIDI from a keyboard to apps and assign different key zones to them; all MIDI transfer can be monitored in order to find problems or to learn what MIDI is doing; (iOS 7.1 or later).

MIDI Wrench (http://www.crudebyte.com/mobile/MIDI_wrench/) For daily MIDI setup tasks; connect a MIDI keyboard, MIDI sound expander, or any other MIDI device to iPad, iPhone, or iPod touch by using the Apple USB camera adapter or any other adapter supported by Apple; visualize MIDI messages sent by the connected MIDI device; send MIDI messages to the connected MIDI device; tool to find problems in MIDI setup or what kind of messages various MIDI devices are sending; supports JACK Audio/MIDI Connection Kit; (iOS 4.3 or later).